Make the "Test audio" connectivity check pod-wide instead of local to the
publisher. Shared on/off state is derived from the presence of the podman-beat
track across participants (self-syncing on join/leave). Any participant can
stop it: the owner unpublishes directly; non-owners send a new additive
BEAT_STOP data message that the owner honors. Drives the button label, status
line, and status waveform for everyone, and guards against rapid-double-click
double-publish and mid-start unmount leaks.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Agent-published LiveKit audio is unreliable for voice: the track is
short-lived (publish, speak ~3s, unpublish) and blocked by browser
autoplay, so participants heard nothing even though the server published
fine. The VOICE_CUE text already arrives over the data channel, so speak
it in the browser via speechSynthesis instead — instant and reliable.
Prime speechSynthesis from user gestures (Enable sound, Share screen) so
later cues are allowed to play.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AaCFWMkYQmTcuPsxaaACft